Covering for a mast structure



FIG. 1 is a bottom/front/right side perspective view of a covering for a mast structure, showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof; and,

FIG. 4 is a left side view thereof.

The claimed design is in the covering for the mast structure. The showing of the trees, the houses and the telephone wire in FIGS. 1, 2 and 3 of the drawings constitutes environmental subject matter which forms no part of the claimed design and which is specifically disclaimed. FIG. 4 of the drawings is an illustration of the claimed design without any showing of environmental matter. 

I claim the ornamental design for covering for a mast structure, as shown and described. 